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2416411 - Disclosure - Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details)
(http://www.columbiapipelinepartners.com/role/PensionAndOtherPostretirementBenefitsComponentsOfPlansNetPeriodicBenefitsCostDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001420783 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
2013-01-01 - 2013-12-31
Scenario [Axis]Scenario [Axis]Scenario [Axis]
Scenario, Unspecified [Domain]Predecessor [Member]Predecessor [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension Plan [Member]Other Postretirement Benefit Plan [Member]Pension Plan [Member]Other Postretirement Benefit Plan [Member]Pension Plan [Member]Other Postretirement Benefit Plan [Member]
Service Cost
5,300,000 1
1,000,000 1
4,800,000 1
1,100,000 1
4,800,000  
1,500,000  
Interest cost
12,500,000 1
4,000,000 1
13,700,000 1
4,600,000 1
12,600,000  
4,900,000  
Expected return on assets
(23,600,000) 
(17,400,000) 
(23,800,000) 
(16,500,000) 
(22,000,000) 
(13,500,000) 
Amortization of prior service cost
(900,000) 
100,000  
(1,000,000) 
100,000  
(900,000) 
100,000  
Recognized actuarial loss
8,200,000  
(200,000) 
6,600,000  
(100,000) 
10,600,000  
1,000,000  
Net Periodic Benefit Costs
1,500,000  
 
(12,500,000) 
 
300,000  
 
(10,800,000) 
 
5,100,000  
 
(6,000,000) 
 
Settlement loss
0  
0  
0  
0  
12,400,000  
0  
Total Net Periodic Benefits Cost
1,500,000  
 
(12,500,000) 
 
300,000  
 
(10,800,000) 
 
17,500,000  
 
(6,000,000) 
 
1: The change in benefit obligation for Pension Benefits represents the change in Projected Benefit Obligation while the change in benefit obligation for Other Postretirement Benefits represents the change in Accumulated Postretirement Benefit Obligation.